Puzzle 2

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Across
  1. 4. unit of measurement of ampere
  2. 7. which gas is emitted by adding dilute sulfuric acid to granulated zinc?
  3. 9. The nearest spiral galaxy apart from the Milky Way galaxy is
  4. 10. twinkling of stars is as a result of ----- of light
  5. 14. what are the biological factors causing disease called
  6. 16. which color of flame is emitted when a ribbon of magnesium is combusted?
  7. 17. Har Gobind Khorana had researched on understanding ----- code
  8. 19. why does the color of tomatoes turn red when ripe?
  9. 20. a disease that can be caused by the deficiency of nicotinic acid for a long time is?
Down
  1. 1. Polio disease is caused by
  2. 2. In the host cell, replication of RNA virus took place in...
  3. 3. Carbonaceous rocks which produce coal and oil belong to the category of rocks called_______.
  4. 5. Heart is made up of ---- muscle
  5. 6. what is the unit of genetics?
  6. 8. who discovered bacteria
  7. 11. Black cotton soils is also called
  8. 12. A virus is made up of a DNA or RNA genome inside a protein shell known as:
  9. 13. spermatophytes are also known as
  10. 15. antibiotics kills?
  11. 18. Ribosome was discovered by?